Manual TM 11-2006 Telephone repeater EE-89-A 1943

some stains , july 14 1943, not a reprint !!

€ 17,00
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These were used to increase the reach of phone lines.  The neat thing is that it's an amplifier that amplifies the signal between A and B as well as the signal between B and A, that's to say each terminal pair is both an input and an output.  For this to work the lines need to have the same impedance looking each way from the amplifier.  The functional check is to short either the input or output and listen on the earphone to see that the amplifier is oscillating at all attenuation settings.

 

There are two ways to power this repeater: either use a BA-40 combined 1.5 & 90 Volt battery by means of the 4-prong plug, or use seperate BA-23 (No. 6) 1.5 V battery and two BA-36 45V batteries in series by means of the 4-prong socket to 4-wire cable.

The single tube is the VT221 (3Q5GT).  There's a single Trimm earphone to monitor conversations going in either direction.

To test operation just short either pair of line terminals and there should be oscillation at all settings of the attenuator.

Normal 20 Hz ringing can be employed on lines equipped with these repeaters.  Ringing signals are transmitted through the repeater.
Made when W-110-B was the common filed wire, but will work with WD-1 field wire.

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  • TM 11-2006 Technical manual Telephone repeater EE-89-A
  • TM 11-2006 Technical manual Telephone repeater EE-89-A
  • TM 11-2006 Technical manual Telephone repeater EE-89-A
  • TM 11-2006 Technical manual Telephone repeater EE-89-A
  • TM 11-2006 Technical manual Telephone repeater EE-89-A